/Engine/Source/Runtime/Core/Public/GenericPlatform/GenericPlatformMisc.h
Retrieves information about the total number of bytes and number of free bytes for the specified disk path.
static bool GetDiskTotalAndFreeSpace ( const [FString](API\Runtime\Core\Containers\FString) & InPath, uint64 & TotalNumberOfBytes, uint64 & NumberOfFreeBytes )